| ERROR | string formed a non-REF mutually-dependent cycle with string |
| CAUSE | This compilation was aborted because the library unit that was compiled would have formed a non-REF mutually-dependent cycle with some other library units. This happens when an attempt is made to compile types that have attributes of other types that may participate in a cycle with this type. Example: create type t1; create type t2 (a t1); create type t1 (a t2); |
| ACTION | Break the cycle (possibly by adding a REF or by using another type). |